"""
This module provides functionality to run benchmarks on different folders within
the 'benchmark' directory, wait for their completion, and generate a report.
"""

# list all folders in benchmark folder
# for each folder, run the benchmark
import contextlib
import json
import os
import subprocess

from datetime import datetime
from itertools import islice
from pathlib import Path
from typing import Iterable, Union

from tabulate import tabulate
from typer import run


def main(
    n_benchmarks: Union[int, None] = None,
):
    """
    Main function that runs benchmarks on folders within the 'benchmark' directory.

    Parameters
    ----------
    n_benchmarks : Union[int, None], optional
        The number of benchmarks to run. If None, all benchmarks are run.

    """

    path = Path("benchmark")

    folders: Iterable[Path] = path.iterdir()

    if n_benchmarks:
        folders = islice(folders, n_benchmarks)

    benchmarks = []
    results = []
    for bench_folder in folders:
        if os.path.isdir(bench_folder):
            print(f"Running benchmark for {bench_folder}")

            log_path = bench_folder / "log.txt"
            log_file = open(log_path, "w")
            process = subprocess.Popen(
                [
                    "python",
                    "-u",  # Unbuffered output
                    "-m",
                    "gpt_engineer.cli.main",
                    bench_folder,
                    "--steps",
                    "benchmark",
                ],
                stdout=log_file,
                stderr=log_file,
                bufsize=0,
            )
            benchmarks.append(bench_folder)
            results.append((process, log_file))

            print("You can stream the log file by running:")
            print(f"tail -f {log_path}")
            print()

    for bench_folder, (process, file) in zip(benchmarks, results):
        process.wait()
        file.close()

        print("process", bench_folder.name, "finished with code", process.returncode)
        print("Running it. Original benchmark prompt:")
        print()
        with open(bench_folder / "prompt") as f:
            print(f.read())
        print()

        with contextlib.suppress(KeyboardInterrupt):
            subprocess.run(
                [
                    "python",
                    "-m",
                    "gpt_engineer.cli.main",
                    bench_folder,
                    "--steps",
                    "evaluate",
                ],
            )

    generate_report(benchmarks, path)


def generate_report(benchmarks, benchmark_path):
    """
    Generates a report of the benchmark results and optionally appends it to a markdown file.

    Parameters
    ----------
    benchmarks : list
        A list of benchmark folder paths that have been processed.
    benchmark_path : Path
        The path to the benchmark directory.

    """

    headers = ["Benchmark", "Ran", "Works", "Perfect", "Notes"]
    rows = []
    for bench_folder in benchmarks:
        memory = bench_folder / ".gpteng" / "memory"
        with open(memory / "review") as f:
            review = json.loads(f.read())
            rows.append(
                [
                    bench_folder.name,
                    to_emoji(review.get("ran", None)),
                    to_emoji(review.get("works", None)),
                    to_emoji(review.get("perfect", None)),
                    review.get("comments", None),
                ]
            )
    table: str = tabulate(rows, headers, tablefmt="pipe")
    print("\nBenchmark report:\n")
    print(table)
    print()
    append_to_results = ask_yes_no("Append report to the results file?")
    if append_to_results:
        results_path = benchmark_path / "RESULTS.md"
        current_date = datetime.now().strftime("%Y-%m-%d")
        insert_markdown_section(results_path, current_date, table, 2)


def to_emoji(value: bool) -> str:
    """
    Converts a boolean value to its corresponding emoji representation.

    Parameters
    ----------
    value : bool
        The boolean value to convert.

    Returns
    -------
    str
        An emoji string representing the boolean value.

    """

    return "\U00002705" if value else "\U0000274C"


def insert_markdown_section(file_path, section_title, section_text, level):
    """
    Inserts a new section into a markdown file at the specified level.

    Parameters
    ----------
    file_path : Path
        The path to the markdown file.
    section_title : str
        The title of the section to insert.
    section_text : str
        The text content of the section to insert.
    level : int
        The header level of the section.

    """

    with open(file_path, "r") as file:
        lines = file.readlines()

    header_prefix = "#" * level
    new_section = f"{header_prefix} {section_title}\n\n{section_text}\n\n"

    # Find the first section with the specified level
    line_number = -1
    for i, line in enumerate(lines):
        if line.startswith(header_prefix):
            line_number = i
            break

    if line_number != -1:
        lines.insert(line_number, new_section)
    else:
        print(
            f"Markdown file was of unexpected format. No section of level {level} found. "
            "Did not write results."
        )
        return

    # Write the file
    with open(file_path, "w") as file:
        file.writelines(lines)


def ask_yes_no(question: str) -> bool:
    """
    Asks a yes/no question and returns the response as a boolean value.

    Parameters
    ----------
    question : str
        The yes/no question to ask.

    Returns
    -------
    bool
        True if the answer is 'yes', False if 'no'.

    """

    while True:
        response = input(question + " (y/n): ").lower().strip()
        if response == "y":
            return True
        elif response == "n":
            return False
        else:
            print("Please enter either 'y' or 'n'.")


if __name__ == "__main__":
    run(main)
